bug#50043: 28.0.50; USABLE_SIGOI undef code paths do not work correctly

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> can you tell where does it hang, and why?  Bonus points for explaining
> why the same scenario doesn't hang for USABLE_SIGIO platforms.

It's hanging here:

x_get_foreign_selection (Lisp_Object selection_symbol, Lisp_Object target_type,
                         Lisp_Object time_stamp, Lisp_Object frame)
{
[...]
  wait_reading_process_output (secs, nsecs, 0, false,
                               reading_selection_reply, NULL, 0);

That is, it's not really hanging hanging, but this sometimes takes a
couple of seconds without SIGIO, while it returns instantaneously with
SIGOI.

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